~ 4 May 2010 ~

location : PD2

defect : motor viper extraction cannot stop

location : black start diesel generator (BSDG)

- check battery : 24V DC battery for start up

- use hydrometer to check water level = 1.28

- use multimeter to check the voltage = 12.30V

- the battery have to check because it will be use as back up when do the blackout test this Sunday (9 May)
- battery: back up for NGR (neutral ground resistor)
- EDG (emergency diesel generator) : to energize station essential board and provide emergency AC supply in case of normal AC power supply failure.

6.6kV --> EDG --> step down 415V --> auxilary Tx

~ 3 May 2010 ~

location : GT1B (PD1)

1) servicing GMCB (general main circuit breaker)

- GMCB is use to connect or isolate generator transformer from the grid.

- there are 3 unites of GMCB, one for each of the two GT's and ST's.
- GMCB uses a hydraulic spring mechanism in order to make or break the circuit.

2) step down the GT1B excitation transformer

generator (15kV) --> excitation transformer (830Vac) --> thyristor (change to DC) --> rotor

3) measure PI at the GMCB
- reading PI (polarization index) must greater than 1.5. it is better if can get greater than 2.

in the GMCB

PI test

~ 30 April 2010 ~

1) change the inverter because it has problem.

2) manually change the setting of the inverter.

Inverter (frequency drive) is use to change AC to AC. In the inverter already have rectifier.

Rectifier is use to change DC to AC.

By using inverter, energy can be saved. The speed of the motor can be change by increase/decrease the H2.
Inverter also can control the speed of motor.

inverter... already setting...

motor that connect to inverter

location : GT Package 1B

preventive maintainance : do the servicing at the breaker ( vacuum circuit breaker)

- do the ohm balance

-check the continuity

- check the isolation resistance

~ 28 April 2010 ~

location : HRSG
preventive maintainance :
- check the motorize valve either open/close 100%
- use WD40 to smoothly the valve function

1) HRSG 1B LP steam unit pipe blow 180V valve
2) HRSG 1B LP drum continuose blow 180V valve
3) HRSG 1B LP inlet HDR drain 180V valve
4) HRSG 1B LP sh inlet pipe AV 180V valve

~ 27 April 2010 ~

location : Field Circuit Breaker
preventive maintainance :
1) to do servicing at the FCB
2) to do servicing at the thyristor

FCB counter = 537

~ 26 April 2010 ~

Follow the technician to do the maintaninance at the CCTV at the gas compressor building and at gas receiving station. It will be check every 4 months.

check list :

1) junction box - to check either it is ok or not, good condition or not. Also check either in the junction box is free from dust and water.

2) lens

3) stand CCTV

PTZ is one the camera that used for CCTV. It can zoom and move right or left.

junction box and stand of CCTV

in the junction box

~ 24 April 2010 ~

Overhaul for GT1B start today. Follow the technician of control and instrumentation (CNI) to open the thermocouple at GT1B.

MOI (major overhaul inspection).

thermocouple without the cable

thermocouple

technician open the thermocouple

~ 23 April 2010 ~

Venue : Water Treatment Plant

Defect : The switch is not touched ( valve )

This plant is to generate the specified quality and quantity of demineralized water.

~ 21 April 2010 ~

Join the technician to check the differential pressure gauge. The difference pressure between inlet and outlet limit until 0.2. If more than 0.2 it is not good. Have to check.

~ 19 April 2010 ~

problem : sump pump cannot cutoff
solve : to check level switch